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Assume that you used a 0.560 g piece of pure aluminum in the synthesis of alum and collected 5.255 g of dry alum. What is your percent yield of alum?
What is the wavelength of light required to induce a transition from the ground state to the first excited state?
Calculate the pressure in the mindanao trench. depth = 11.5 km and the average mass density of sea water
If 80 {rm J} of heat are added to a pure gold coin with a mass of 13 {rm g}, what is its temperature change? Specific heat capacity of gold is 0.128 rm J/g ^circ C.
A 0.2254 g sample of naphthalene (C8H10, 128.16 g/mol) was burned in a bomb calorimeter with a heat capacity of 2.18 kJ/K, and the temperature increased by 4.16°C. What is the molar enthalpy of combustion for this compound
an airplane is pressurized to 650 mmhg. The partial pressure of oxygen is 137 mmhg. If the partial pressure of oxygen drops below 100.mmhg.
The buret is misaligned with the drop counter so approximately 10 drops of NaOH are added to the HCl before they are counted
An aqueous solution containing 0.18 M of unknown base has a measured pH equal to 8.27. What is the value of pKb for the unknown base?
A chemist needs to determine the concentration of a solution of nitric acid, HNO_3. She puts 865 mL of the acid in a flask along with a few drops of indicator.
Assuming the solution has a heat capacity of 4.18 J/°C·g and assuming no heat loss to the calorimeter, calculate the enthalpy change for the dissolution of NH4NO3 in units of kJ/mol.
Calculate the theoretical titration curve for the titration of 50.00 mL of 0.1000 M Na2CO3 with a 0.2000 M solution of HCl. Propose the indicators.
What is the percent yield of ammonia when 150.0 g of nitrogen reacts with 32.1 g of hydrogen if the actual yield is 174 grams?
Pick the words that correctly finishes the following sentence. A reaction will always be spontaneous if it is and there is an increase in disorder
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